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The first phase of this tidyup is focussed on the header files, and in
particular making sure we are exposinng publicly exactly what we need
to, and no more.

 - Rts.h now includes everything that the RTS exposes publicly,
   rather than a random subset of it.

 - Most of the public header files have moved into subdirectories, and
   many of them have been renamed.  But clients should not need to
   include any of the other headers directly, just #include the main
   public headers: Rts.h, HsFFI.h, RtsAPI.h.

 - All the headers needed for via-C compilation have moved into the
   stg subdirectory, which is self-contained.  Most of the headers for
   the rest of the RTS APIs have moved into the rts subdirectory.

 - I left MachDeps.h where it is, because it is so widely used in
   Haskell code.
 
 - I left a deprecated stub for RtsFlags.h in place.  The flag
   structures are now exposed by Rts.h.

 - Various internal APIs are no longer exposed by public header files.

 - Various bits of dead code and declarations have been removed

 - More gcc warnings are turned on, and the RTS code is more
   warning-clean.

 - More source files #include "PosixSource.h", and hence only use
   standard POSIX (1003.1c-1995) interfaces.

There is a lot more tidying up still to do, this is just the first
pass.  I also intend to standardise the names for external RTS APIs
(e.g use the rts_ prefix consistently), and declare the internal APIs
as hidden for shared libraries.

amazing this hasn't caused any problems before now

Contributed by: seliopou@gmail.com
    
This patch modifies darcs-all to have feature parity with push-all by
recognizing two new options.

    * -i, equivalent to --ignore-failure in push-all
    * -r <repo>, specifies the remote repository darcs commands will use

Some example commands:

Get the libraries from a repository of your choosing. This is useful
when working with a git mirror:

    $ ./darcs-all -r http://darcs.haskell.org get

Pull changes. Used to be:

    $ ./push-all --pull http://darcs.haskell.org

Is now:

    $ ./darcs-all -r http://darcs.haskell.org pull

Or to use the default remote of the ghc repository:

    $ ./darcs-all pull

This prints a combined hash of the ABIs exposed by the modules listed
on the command line.  It will be used by Cabal for generating a
package Id based on the actual ABI of a package.

We were making arrays with range (0, n-1) which is bad if n == 0 now
that we are using Word types.

We were keeping things as Int, and then converting them to Word16 at
the last minute, when really they ought to have been Word16 all along.

For inexpensive assertions

Instead of chr_$wchr, we now just get $wchr.  In general, when an
OccName is system-generated, we leave it out of the final external
name, preferring to use the name of the exported parent instead (which
is necessarily a user-written name).

Names should be no less deterministic, but should be shorter and more
readable.

It still lives in darcs, if anyone wants to revive it sometime.